Relevant bibliographies by topics / Cornea Keratoconus. LASIK (Eye surgery)

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Academic literature on the topic 'Cornea Keratoconus. LASIK (Eye surgery)'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Cornea Keratoconus. LASIK (Eye surgery)"

1

Abdolahian, Milad, Mohammad Ali Moalem, Mohammadreza Jahady Hoseiny, Farsad Noorizadeh, and Athar Zareei. "Keratorefractive Surgery Outcomes in Keratoconus Suspect Patients." Journal of Ophthalmology 2020 (December 2, 2020): 1–11. http://dx.doi.org/10.1155/2020/8823744.

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Purpose. To examine the outcomes of keratorefractive surgeries in keratoconus suspect patients. Methods. This study included 192 keratoconus suspects (351 eyes), treated with photorefractive keratectomy (PRK) (211 eyes), Lasik (96 eyes), and Femto-Lasik (44 eyes) surgeries in an eye clinic. The best spectacle-corrected visual acuity (BSCVA) and subjective refraction were evaluated preoperatively and postoperatively (three months and five years after the procedure). The Orbscan II topography system was also used preoperatively and five years after the procedure. Results. The patients’ mean age was 31.6 ± 5.49 years (range: 21–47 years) in the last follow-up. There was no significant difference between the preoperative and postoperative mean values of BSCVA in any of the surgical methods ( P = 0.49). The mean spherical equivalent, cylindrical power, corneal curvature, the thinnest corneal thickness, and the central corneal thickness decreased significantly in the last follow-up ( P < 0.001). Four patients (3.50%) in the PRK group and one patient (1.85%) in the Lasik group needed glasses in the last follow-up. Eleven cases of corneal ectasia were detected in the last follow-up (six eyes of four patients [2.84%] and five eyes of four patients [5.20%] in the PRK and Lasik groups, respectively). Conclusion. In the present study, the high risk of postoperative ectasia was detected in keratoconus suspects following PRK and Lasik surgeries. According to the results, it can be concluded that Femto-Lasik surgery provides better outcomes than Lasik and PRK. Overall, the surgical criteria are suggested to be evaluated case by case, and the patients must be followed up over time to assess the corneal topography and refraction stability.
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Tatar, Mehmet Gurkan, Feride Aylin Kantarci, Aydin Yildirim, Haşim Uslu, Hatice Nur Colak, Hasan Goker, and Bulent Gurler. "Risk Factors in Post-LASIK Corneal Ectasia." Journal of Ophthalmology 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/204191.

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Purpose. To evaluate the risk factors for post-laser in situ keratomileusis (LASIK) ectasia.Materials and Methods. Medical records of 42 eyes of 28 (10 women, 18 men) patients who developed corneal ectasia after LASIK were retrospectively reviewed. Topographical features and surgical parameters of those patients were evaluated.Results. The mean age of patients was34.73±6.50(23–48) years and the mean interval from LASIK to the diagnosis of post-LASIK ectasia was36.0±16.92(12–60) months. The following factors were determined as a risk factors: deep ablation (>75 μm) in 10 eyes, FFK (forme fruste keratoconus) in 6 eyes, steep cornea (>47 D) in 3 eyes, pellucid marginal degeneration (PMD) in 2 eyes, thin cornea (<500 μm) in 2 eyes, thin and steep cornea in 2 eyes, thin cornea and deep ablation in 5 eyes, FFK and steep cornea in 2 eyes, and FFK, steep cornea, and deep ablation in 1 eye. However no risk factor has been determined in 9 eyes (21.4%).Conclusion. The findings of our study showed that most of the patients who developed post-LASIK ectasia have a risk factor for post-LASIK ectasia. However, the most common risk factor was deep ablation.
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Valbon, Bruno Freitas, Juliana Glicéria, Rodrigo Santos, and Milton Ruiz Alves. "Unilateral Corneal Ectasia after Bilateral LASIK: The Thick Flap Counts." International Journal of Keratoconus and Ectatic Corneal Diseases 2, no. 2 (2013): 79–83. http://dx.doi.org/10.5005/jp-journals-10025-1056.

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ABSTRACT Purpose To report a case of post-LASIK corneal ectasia due to a thick flap, while the contralateral eye did not develop ectasia after an incomplete deep flap cut, followed by a thinner flap LASIK procedure. Methods Case report Results This 45 years old female patient had bilateral myopic LASIK in 1999. Preoperative anterior curvature map was regular with no signs of keratoconus. Central keratometry was 42.88 × 44.70 @ 163 in OD and 43.43 × 45.24 @ 175 in OS. Ultrasound central corneal thickness was 586 μm and 619 μm in the right eye and left eye, respectively. Corneal OCT identified a deep meniscus-shaped LASIK flap, with a central thickness of a 392 μm in the right eye, and an incomplete deep peripheral cut in the left eye with a thinner meniscus-shaped LASIK flap. Conclusion Unilateral ectasia after LASIK may occur due to a thick flap which leads to biomechanical failure of the cornea. How to cite this article Valbon BF, Ambrosio R Jr, Glicéria J, Santos R, Luz A, Alves MR. Unilateral Corneal Ectasia after Bilateral LASIK: The Thick Flap Counts. Int J Kerat Ect Cor Dis 2013;2(2):79-83.
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Surkova, V. K., A. R. Khalimov, and G. M. Kazakbaeva. "Keratectasias and modern methods of their treatment." POINT OF VIEW. EAST – WEST, no. 2 (May 31, 2021): 84–88. http://dx.doi.org/10.25276/2410-1257-2021-2-84-88.

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The review article provides non-surgical (spectacle and contact correction, ultraviolet corneal crosslinking) and surgical methods (corneal transplantation, intrastromal implantation of segments and rings) for the treatment of keratoectasias and, in particular, keratoconus. The authors present their own original developments of scientists from the Ufa Research Institute of Eye Diseases in the field of cross-linking and various types of keratoplasty, as well as promising areas of clinical research on the combined treatment of keratectasias: cross-linking in combination with LASIK, intrastromal introduction of segments and rings. Key words: cornea, keratectasias, keratoconus, non-surgical and surgical methods of treatment.
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Hayes, Sally, Siân R. Morgan, and Keith M. Meek. "Keratoconus: cross-linking the window of the eye." Therapeutic Advances in Rare Disease 2 (January 2021): 263300402110035. http://dx.doi.org/10.1177/26330040211003573.

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Keratoconus is a condition in which the cornea progressively thins and weakens, leading to severe, irregular astigmatism and a significant reduction in quality of life. Although the precise cause of keratoconus is still not known, biochemical and structural studies indicate that overactive enzymes within the cornea break down the constituent proteins (collagen and proteoglycans) and cause the tissue to weaken. As the disease develops, collagen fibres slip past each other and are redistributed across the cornea, causing it to change shape. In recent years, it was discovered that the photochemical induction of cross-links within the corneal extracellular matrix, through the use of riboflavin and ultraviolet (UVA) light, could increase the strength and enzymatic resistance of the tissue and thereby halt keratoconus progression. Worldwide acceptance and use of riboflavin/UVA corneal cross-linking therapy for halting keratoconus progression has increased rapidly, in accordance with the growing body of evidence supporting its long-term effectiveness. This review focusses on the inception of riboflavin/UVA corneal cross-linking therapy for keratoconus, its clinical effectiveness and the latest scientific advances aimed at reducing patient treatment time, improving patient comfort and increasing patient eligibility for treatment. Plain language summary Review of current treatments using cross-linking to halt the progress of keratoconus Keratoconus is a disease in which the curved cornea, the transparent window at the front of the eye, weakens, bulges forward into a cone-shape and becomes thinner. This change of curvature means that light is not focussed onto the retina correctly and vision is progressively impaired. Traditionally, the effects of early keratoconus were alleviated by using glasses, specialist contact lenses, rings inserted into the cornea and in severe cases, by performing a corneal transplant. However, it was discovered that by inducing chemical bonds called cross-links within the cornea, the tissue could be strengthened and further thinning and shape changes prevented. The standard cross-linking procedure takes over an hour to perform and involves the removal of the cells at the front of the cornea, followed by the application of Vitamin B2 eye drops and low energy ultraviolet light (UVA) to create new cross-links within the tissue. Clinical trials have shown this standard procedure to be safe and effective at halting keratoconus progression. However, there are many treatment modifications currently under investigation that aim to reduce patient treatment time and increase comfort, such as accelerated cross-linking procedures and protocols that do not require removal of the surface cells. This review describes the different techniques being developed to carry out corneal cross-linking efficiently and painlessly, to halt keratoconus progression and avoid the need for expensive surgery.
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Song, Yinyu, Lihua Fang, Ruirui Du, Luchao Lin, and Xingming Tao. "The corneal biomechanical changes after SMILE and LASIK refractive surgery were compared based on finite element analysis." E3S Web of Conferences 271 (2021): 03045. http://dx.doi.org/10.1051/e3sconf/202127103045.

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The three-dimensional (3D) finite element model of human eye was established, and the intraocular pressure (IOP) was loaded to simulate refractive surgery. The biomechanical properties of human cornea after SMILE and LASIK surgery were studied from the stress, strain and induced wavefront aberration. Our results showed that SMILE had less impact on the biomechanics, having less stress and strain changes than LASIK. However, the stress and strain of the cornea increased with the increase of the diopter and were concentrated in the central region. We also investigated the changes in wavefront aberrations of the cornea after surgery, and the results indicated that the defocus and vertical commotion were significantly affected by SMILE and LASIK surgery, while the remaining aberrations were approximately unchanged. In conclusion, both SMILE and LASIK sergury procedures changed the postoperative corneal biomechanics, but SMILE had less impact on the biomechanics of corneal.
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Hefner-Shahar, Hagar, and Nir Erdinest. "High-order Aberrations in Keratoconus." International Journal of Keratoconus and Ectatic Corneal Diseases 5, no. 3 (2016): 128–31. http://dx.doi.org/10.5005/jp-journals-10025-1133.

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ABSTRACT With all the technological advances today and the increasing number of people undergoing refractive surgery, the importance of detecting keratoconus (KC) prior to surgery has become evident. Although by using a topographer we can detect early stage KC, however, by using wavefront analysis technology, we are able to detect KC at an even earlier stage. Every eye possesses a number of aberrations. However, in a KC patient's eye, there are approximately five to six times the numbers of high-order aberrations (HOAs) than in a healthy eye. Using this technology to detect and assess the HOAs, it was found that in a KC cornea, it is possible to detect at a very early stage a much higher value of vertical coma aberrations compared with a normal eye. By using this technology, it is possible to study and understand the characteristics of the quality of the image on the retina, thereby understanding its impact on the patient's visual quality. How to cite this article Hefner-Shahar H, Erdinest N. Highorder Aberrations in Keratoconus. Int J Kerat Ect Cor Dis 2016;5(3):128-131.
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Shilova, T. Yu. "ReLEx® SMILE® – the third generation of laser eye surgery." EYE GLAZ 22, no. 4(132) (December 16, 2020): 52–58. http://dx.doi.org/10.33791/2222-4408-2020-4-52-58.

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ReLEx® (Refractive lenticule extraction) SMILE® (SMall Incision Lenticula Extraction) is the third generation of laser eye surgery, which is a follow-on to PRK (the first generation) and LASIK (the second generation). This technology has expanded the possibilities for the comfort and safety of the procedure, reduced the requirements for the thickness of the cornea, and made it extremely comfortable for the patient. SMILE® method helps improve vision in case of myopia, myopic and mixed astigmatism. The article analyzes the advantages and disadvantages of this technology, its possible risks and side effects. The data represented in this article was obtained by analyzing scientific publications and practical expertise.
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Panova, I. E., A. V. Titov, and D. R. Mirsaitova. "Tear Replacement Therapy in Medical Support of Patients after Femto-LASIK Keratorefractive Surgery." Ophthalmology in Russia 17, no. 2 (June 23, 2020): 274–80. http://dx.doi.org/10.18008/1816-5095-2020-2-274-280.

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Purpose — to analyze the effectiveness of artificial tear drops HYLOPARIN-COMOD® in the complex medical support of the FemtoLASIK operation based on monitoring of clinical, functional and morphometric indicators of the eye surface’s condition. Patients and methods. The study included 25 patients (50 eyes) who underwent a keratorefractive surgery (Femto-LASIK) and were prescribed instillations of artificial tear drops HILOPARIN-COMOD®. To analyze the effectiveness of artificial tear drops HYLOPARIN-COMOD® in the complex medical support of the Femto-LASIK operation based on monitoring of clinical, functional and morphometric indicators of the eye surface’s condition: UCVA, BCVA, Schirmer’s II test, tear break-up time (Norn’s test), OCT pachymetry of the cornea and corneal flap. The treatment effectiveness was evaluated at 1 day, 1 week, 1 and 3 months after the surgery. Results. As a result of the treatment, the following refractive data were obtained: UCVA increased from 0.09 ± 0.02 to 0.94 ± 0.07 on the first day after surgery and to 0.96 ± 0.04 and 0.99 ± 0.07 to 1 and 3 months of follow-up, BCVA respectively, from 0.97 ± 0.04 to 0.94 ± 0.07, 0.97 ± 0.07 and 0.99 ± 0.07 after surgery. A faster restoration of the cornea and corneal valve was revealed, as evidenced by a decrease in their thickness already in the 1st week after surgery in comparison with the control group, where were more pronounced changes occur only by the 1st and 3rd month of observation (p ≤ 0.05). There was a significant increase in the basal secretion of the lacrimal gland (Schirmer’s II test) from 10.16 ± 1.33 to 11.66 ± 1.13 and 12.88 ± 0.96 µm by 1 and 3 months after surgical treatment, respectively (p ≤ 0.05). The Norn’s test increased from 10.89 ± 1.94 to 12.78 ± 1.59 and 13.83 ± 0.5 s to 1 and 3 months of treatment, respectively (p ≤ 0.05). Conclusion. The effectiveness of the HILOPARIN-COMOD® use in the correction of the dry eye syndrome after keratorefractive operations has been proven. The obtained results clearly demonstrate that the HILOPARIN-COMOD® preparation enhances not only the stability of the tear film, but also the restoration of the OCT morphometric parameters of the thickness of the cornea and corneal flap.
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Crouzier, David, Vincent Dabouis, Edgar Gentilhomme, Rodolphe Vignal, Fréderic Bourbon, Florence Fauvelle, and Jean-Claude Debouzy. "Chronic Electromagnetic Exposure at Occupational Safety Level Does Not Affect the Metabolic Profile nor Cornea Healing after LASIK Surgery." Journal of Ophthalmology 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/762364.

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LASIK eye surgery has become a very common practice for myopic people, especially those in the military. Sometimes undertaken by people who need to keep a specific medical aptitude, this surgery could be performed in secret from the hierarchy and from the institute medical staff. However, even though the eyes have been previously described as one of the most sensitive organs to electromagnetic fields in the human body, no data exist on the potential deleterious effects of electromagnetic fields on the healing eye. The consequences of chronic long-lasting radar exposures at power density, in accordance with the occupational safety standards (9.71 GHz, 50 W/m2), were investigated on cornea healing. The metabolic and clinical statuses after experimental LASIK keratotomy were assessed on the different eye segments in a New Zealand rabbit model. The analysis methods were performed after 5 months of exposure (1 hour/day, 3 times/week). Neither clinical or histological examinations, nor experimental data, such as light scattering,1H-NMR HRMAS metabolomics,13C-NMR spectra of lipidic extracts, and antioxidant status, evidenced significant modifications. It was concluded that withdrawing the medical aptitude of people working in electromagnetic field environments (i.e., radar operators in the navy) after eye surgery was not justified.
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Dissertations / Theses on the topic "Cornea Keratoconus. LASIK (Eye surgery)"

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Tang, Maolong. "Corneal mean curvature mapping application in laser refractive surgery /." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1094593446.

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Lam, Wing-wah Phoebe. "A systematic review of postoperative treatments for laser eye surgery." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25549686.

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Goggin, Michael Joseph. "Outcome and complications of photorefractive keratectomy for myopia and astigmatism /." Title page, table of contents and aims only, 2003. http://web4.library.adelaide.edu.au/theses/09MS/09msg613.pdf.

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林穎華 and Wing-wah Phoebe Lam. "A systematic review of postoperative treatments for laser eye surgery." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31970643.

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Books on the topic "Cornea Keratoconus. LASIK (Eye surgery)"

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LASIK: The evolution of refractive surgery. Thorofare, NJ: SLACK, 2012.

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Grandon, Stanley C. The complete guide to refractive surgery. 2nd ed. Dearborn, Mich. (15212 Michigan Ave., Dearborn 48126): Patton Pub. Co., 1999.

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Rapuano, Christopher J. Refractive surgery. 2nd ed. [San Francisco, Calif.]: American Academy of Ophthalmology, 2011.

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Gimbel, Howard V. LASIK complications: Prevention and management. Thorofare, NJ: SLACK, 1999.

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1953-, Slade Stephen, ed. PRK: Past, present, and future. Thorofare, NJ: SLACK, 2012.

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(Editor), Shashi Kapoor, Ionnis G. Pallikaris (Editor), and Srinivas K. Rao (Editor), eds. Lasik Surgery: Tips And Tricks. Anshan Publishers, 2007.

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1953-, Belville J. Kevin, and Smith Ron J. 1963-, eds. LASIK techniques: Pearls and pitfalls. Thorofare, NJ: Slack, 2004.

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LASIK Techniques: Pearls and Pitfalls. Slack Incorporated, 2003.

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1961-, Machat Jeffery J., Slade Stephen 1953-, and Probst Louis E, eds. The art of LASIK. 2nd ed. Thorofare, NJ: SLACK, Inc., 1999.

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Mini Atlas of Lasik Surgery (Anshan Gold Standard Mini Atlas). Anshan Pub, 2008.

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Book chapters on the topic "Cornea Keratoconus. LASIK (Eye surgery)"

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Rojas Alvarez, Eduardo. "Cornea Confocal Microscopy: Utilities and Perspectives." In Biomedical Signal and Image Processing. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96272.

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The cornea is the ocular refractive medium with the greatest refractive power of the eye. The study of it is of vital importance for the diagnosis and follow-up of ophthalmological diseases with the aim of achieving high standards of visual acuity in our patients. Confocal microscopy of the cornea allows in-depth study of it, quickly, safely, painlessly, obtaining high-resolution images of the corneal sublayers. This chapter summarizes the procedure for performing corneal confocal microscopy, the normal characteristics of the tissue with real images of our patients, as well as a brief explanation of the main applications of this technology in the study of corneal dystrophies (keratoconus), in refractive surgery, corneal transplantation, infectious keratitis, glaucoma filtration bulla, among other topics.
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Conference papers on the topic "Cornea Keratoconus. LASIK (Eye surgery)"

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Pinsky, Peter M., and Dolf van der Heide. "Modeling the Optical Performance of the Human Cornea Following Refractive Surgery." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192579.

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Disturbances of the stromal microstructure occurring in refractive surgical procedures may create unexpected and undesired changes to the vision quality of the eye. Examples of common procedures which can profoundly alter the integrity of the stroma include laser ablation techniques such as Laser in situ keratomileusis (LASIK) for treating myopia, hyperopia and astigmatism, scleral incisions for lens extraction in cataract surgery and conducting keratoplasty (CK) for the treatment of hyperopia and presbyopia. The stroma is the primary load-carrying layer of the cornea and in the normal eye it is in a state of tension resulting from the intraocular pressure (IOP). When a surgical procedure disrupts the stromal tissue, the stresses in the tissue will be redistributed inducing what may be called the biomechanical response of the tissue to the surgical procedure. In the case of LASIK and CK, for example, surgeons wish to change the optical power of the cornea by reshaping the anterior surface. Biomechanically induced deformations may cause the achieved power to deviate from the planned correction and may also introduce aberrations in the resulting optical path. In contrast, in cataract surgery, surgeons may wish to preserve the original power of the cornea and in this case biomechanical deformations may defeat this objective.
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Kushwaha, Sandeep Singh, and P. S. Ghoshdastidar. "Numerical Prediction of the Temperature Distribution Within a Human Eye During Laser Surgery." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56259.

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In this paper a computational heat transfer model for prediction of the temperature distribution within the human eye during laser surgery is presented. The heat transfer within a tissue is described by the classic Pennes bioheat transfer equation. The intraocular temperature distribution is calculated using finite-difference method. Two types of computational domain have been considered: (i) rectangular parallelepiped and (ii) cylindrical. The eye is modeled as a composite layered structure consisting of four different ocular tissues, namely, cornea, aqueous, lens and vitreous. It is assumed that the eye is symmetrical about the pupillary axis. The absorption probability of ocular tissue is modulated based on the Lambert-Beer’s law to reproduce the exponential attenuation of the laser light with depth within a biomaterial. The heat flow is modeled as transient and three-dimensional for rectangular parallelepiped geometry and two-dimensional (axi-symmetric) for the cylindrical geometry. The results indicate that for the insulation condition imposed on the periphery of the eye the model based on rectangular parallelepiped geometry of the eye at no laser power and at the initial temperature of 25°C predicts temperature closer to in-vitro experimental measurements reported in literature whereas the model based on cylindrical geometry predicts higher temperature. The opposite is true (that is, lower temperature is predicted by the model based on cylindrical geometry) for high laser heat flux (2000 W/m2) and higher initial temperature (37°C). This study also presents changes in eye temperature subjected to intermittent laser source used in laser surgery techniques such as PRK and LASIK. A comparison of the results based on three different boundary conditions such as convection (hb = 10 W/m2K), constant temperature (37°C) and insulation on the eye periphery reveals that the model based on insulation condition predicts results closer to that of in-vitro experiment at no laser power and initial temperature of 25°C whereas at a laser power of 200 W/m2 and at the initial temperature of 37°C insulation boundary condition produces highest temperature followed by that produced by convection and constant temperature conditions. The heat transfer is one-dimensional for the insulated eye periphery whereas multi-dimensional heat flow takes place when the circumferential boundary condition is either convective or isothermal.
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